"You have to completely disrobe and then put a dressing gown on, but they’re very comfy ones, you can’t walk around in just a thong, can you imagine?" Holland continued. "And then you race across the lot to the toilet, then come back, get back into it -- it’s such a mission."

It seems it was all worth it for the 21-year-old actor, however, who gushed to ET at the film's L.A. premiere on Wednesday about the movie, swinging into theaters July 7.

"I'm losing my mind right now," Holland admitted. "This is so surreal. My whole, like, last three years has been leading up to this moment, and we're here today and I can't believe it. I genuinely can't believe it."